/**
 * Setup jsdom environment for Stencil component testing
 *
 * This module provides polyfills and initialization for testing Stencil components
 * in a jsdom environment. It handles:
 * - Polyfilling adoptedStyleSheets for Shadow DOM
 * - Polyfilling CSS support detection
 * - Polyfilling requestAnimationFrame and related APIs
 * - Loading and initializing Stencil lazy loader
 *
 * @example
 * ```ts
 * // vitest.config.ts
 * export default defineVitestConfig({
 *   test: {
 *     setupFiles: ['@stencil/vitest/jsdom-setup'],
 *   },
 * });
 * ```
 */
/**
 * Apply polyfills to a jsdom window object for Stencil components
 * This function is reused by both the setup file and the custom environment
 */
export declare function applyJsdomPolyfills(window: Window & typeof globalThis): void;
/**
 * Initialize jsdom environment for Stencil testing
 */
export declare function setup(): Promise<void>;
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